The average age of 12 students is 20 years. If the age of one more student is included, the average decreased by 1. What is the age of the new student?
A7 years
B8 years
C6 years
D10 years
Answer:
A. 7 years
Read Explanation:
Total age of 12 students = 12 x 20 = 240
Total age of 13 students = 13 x 19 = 247
Age of the new students = 247 - 240 = 7